In present days, the semisolid metal forming (SSF) is an emerging casting technique for producing critical automotive, military and aerospace components. The essence of the SSF process relies primarily on distinct rheological behaviour of the alloy during casting under shear. The rheology of slurries has to be properly understood for successful implication of the SSF process. In this work, the author presented an overview of the rheological behavior of semisolid A356 alloy under cooling. The author discussed on model for evolution of structural parameter and apparent viscosity of the semisolid slurry under cooling.